1321113515155 has 32 divisors (see below), whose sum is σ = 1980273623040. Its totient is φ = 825113986560.

The previous prime is 1321113515147. The next prime is 1321113515159. The reversal of 1321113515155 is 5515153111231.

It is not a de Polignac number, because 1321113515155 - 2³ = 1321113515147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321113515155.

It is not an unprimeable number, because it can be changed into a prime (1321113515159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35793795 + ... + 35830684.

It is an arithmetic number, because the mean of its divisors is an integer number (61883550720).

Almost surely, 2^{1321113515155} is an apocalyptic number.

1321113515155 is a deficient number, since it is larger than the sum of its proper divisors (659160107885).

1321113515155 is a wasteful number, since it uses less digits than its factorization.

1321113515155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71624539.

The product of its digits is 11250, while the sum is 34.

Adding to 1321113515155 its reverse (5515153111231), we get a palindrome (6836266626386).

The spelling of 1321113515155 in words is "one trillion, three hundred twenty-one billion, one hundred thirteen million, five hundred fifteen thousand, one hundred fifty-five".